Miniature rose plant named ‘Ruiskjol’

ABSTRACT

A distinctive cultivar of miniature rose plant named ‘Ruiskjol’, characterized by its glossy dark green leaves; large double scarlet red-colored flowers; and excellent postproduction longevity.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of theminiature rose class, botanically known as Rosa hybrida, and hereinafterreferred to by the cultivar name Ruiskjol.

The new miniature rose is a naturally-occurring whole plant mutation ofthe commercial Rosa hybrida cultivar Ruimats, disclosed in U.S. PlantPat. No. 10,820. The new minature rose was discovered and selected bythe Inventor in a greenhouse in Hazerswoude, The Netherlands. Plants ofthe new miniature rose differ from plants of the parent cultivarprimarily in flower color as plants of the cultivar Ruimats have darkorange-colored flowers.

Asexual reproduction of the new cultivar by cuttings taken atHazerswoude, The Netherlands, has shown that the unique features of thisnew miniature rose plant are stable and reproduced true to type insuccessive generations of asexual reproduction.

SUMMARY OF THE INVENTION

The following traits have been repeatedly observed and are determined tobe the unique characteristics of ‘Ruiskjol’. These characteristics incombination distinguish the new miniature rose plant as a new anddistinct cultivar:

1. Glossy dark green leaves.

2. Large double scarlet red-colored flowers.

3. Excellent postproduction longevity.

The new miniature rose plant has not been observed under all possibleenvironmental conditions. The phenotype may vary significantly withvariations in environment such as temperature and light level, without,however, any variance in genotype.

BRIEF DESCRIPTION OF PHOTOGRAPH

The accompanying colored photograph illustrates typical plants of thenew miniature rose plant, showing the colors as true as it is reasonablypossible to obtain in colored reproductions of this type. Colors in thephotograph may differ slightly from the color values cited in thedetailed botanical description which more accurately describe the actualcolors of the new miniature rose. The photograph comprises a topperspective view of a large container of multiple plants of the newminiature rose grown in Keller, Tex.

DETAILED BOTANICAL DESCRIPTION

The following observations and measurements describe plants grown inKeller, Tex., in 15-cm containers under conditions which closelyapproximate commercial outdoor production conditions during the summerand early autumn. Plants used for the description were about 15 weeksold.

In the following description, color references are made to The RoyalHorticultural Society Colour Chart except where general terms ofordinary dictionary significance are used.

Classification:

Botanical.—Rosa hybrida cultivar Ruiskjol.

Commercial.—Miniature pot rose.

Parentage: Naturally-occurring whole plant mutation of Rosa hybrida,disclosed in U.S. Plant Pat. No. 10,820.

Propagation:

Type.—Terminal or stem cuttings.

Time to rooting.—8 to 10 days with soil temperatures of 20° C.

Root description.—Propagates easily, roots strong and well-branched.

Plant description:

Form.—Mostly upright; somewhat open.

Plant height.—About 35 cm.

Plant width.—About 28 cm.

Growth habit.—Vigorous. Suitable for 10-cm and larger containers.

Crop time.—Time to produce a finished plant in a 10-cm container 20 to30 cm in height and 15 to 20 cm in width is generally about 10 to 12weeks depending on average temperature, light level, and culturalpractices.

Stem and lateral branches.—Branching habit: Freely; branches willpotentially form at every node. Diameter of lateral branches, at base:About 4 mm. Internode length: About 2.1 cm. Texture: Glabrous. Color:144A or slightly darker. Prickles: Length: About 4 mm. Color: Lightbrown.

Foliage description.—Leaves arranged alternately, compound withtypically three to seven leaflets per leaf, generally symmetrical,abundant, and flat to slightly concave in aspect. Stipules at petiolebase; stipules about 6 mm in length. Leaflet length: About 2.4 cm.Leaflet width: About 1.5 cm. Shape: Ovate. Apex: Acute. Base: Obtuse.Margin: Serrate. Texture, both surfaces: Glabrous, leathery. Venationpattern: Pinnate. Petiole length: About 1.7 cm to base of lower leaflet;about 3.4 cm to base of terminal leaflet. Petiole diameter: About 1 mm.Petiole texture: Smooth. Color: Young foliage, upper surface: Close to146A. Young foliage, lower surface: Close to 146B to 146C. Maturefoliage, upper surface: Close to 146A to 147A; reddish, 59A, overtonestowards and at margins. Mature foliage, lower surface: Close to 146B to147B. Venation, both surfaces: Similar to ground color. Petiole: Uppersurface, close to 59A; lower surface, 146B.

Flower description:

Flower type and habit.—Large double scarlet red flowers. Consistentlysymmetrical rosette flowers that are relatively flat in shape. Freelyand continuously flowering. The flowers are borne singly on peduncles orarranged in large sprays with about two or three flowers per spray.Flower persistent.

Flowering season.—Year-round under greenhouse conditions, optimalflowering from spring through autumn under garden conditions.

Flower diameter.—About 3.6 cm.

Flower depth (height).—About 2.1 cm.

Flower longevity on plant.—About 12 to 14 days.

Fragrance.—Very faint, typical of Rosa.

Flower buds (stage of showing color).—Shape: Ovoid. Length: About 1.1cm. Diameter: About 8 mm. Color: Close to 46A.

Petals.—Quantity: About 36 per flower; typically about seven rows.Length, outer petals: About 1.7 cm. Width, outer petals: About 1.8 cm.Shape: Roughly cordate. Apex: Cuspidate. Base: Acute. Margin: Entire.Texture: Smooth, velvety. Color: When opening, upper surface: 46A; base,white. When opening, lower surface: 46B; base, white. Fully opened,upper surface: 45A to 46A; flower color resists fading with subsequentdevelopment; base, white. Fully opened, lower surface: 46B to 46C; base,white.

Sepals.—Quantity: Typically five per flower. Length: About 1.9 cm.Diameter: About 5 mm. Shape: Narrowly ovate with sharply acutefoliaceous appendages. Apex: Sharply pointed. Base: Truncate. Texture:Pubescent, fine white hairs on upper surface. Color: Upper surface;146A; covered with fine white hairs. Lower surface: 146A.

Peduncles.—Strength: Good yet flexible. Aspect: Erect. Length: About 3.2cm. Color: 146A with red, close to 59A, overtones.

Reproductive organs.—Stamens: Quantity: About 42 per flower. Anthersize: About 1.5 by 1 mm. Anther shape: Bilobate. Anther color: Close to4A. Pistils: Quantity: About 18 per flower. Style length: About 3.5 mm.Style color: Close to 4A.

Seed.—Seed production has not been observed.

Disease resistance: Plants of the new miniature rose have not been shownto be resistant to Powdery Mildew.

Temperature tolerance: Plants of the new miniature rose have been shownto be tolerate to temperatures ranging from 0 to 45° C.

It is claimed:
 1. A new and distinct miniature rose plant named ‘Ruiskjol’, as 